Pixel circuit and display device

Abstract

The present invention discloses a pixel circuit and a display device. The pixel circuit includes: a first reset module, a second reset module, an energy storage module, a compensation module, and a control and driving module. The first reset module is respectively connected to a first scan signal terminal, an initial voltage terminal, and a first node; the second reset module is respectively connected to a second scan signal terminal, an initial voltage terminal, and a second node; the energy storage module is connected between the first node and the second node; the compensation module is respectively connected to the first node and the second scan signal terminal; and the control and driving module is respectively connected to a power supply terminal, a first control signal terminal, and the compensation module. During a reset phase, the first to second reset modules, the compensation module, and the control and driving module reset the voltages of the first and second nodes based on the initial voltage of the initial voltage terminal and the power supply voltage of the power supply terminal under the action of output signals from the first to second scan signal terminals and the first control signal terminal. This circuit can broaden the range of initial voltage selection.

Description

Technical Field

[0001] The present invention relates to the field of OLEDs, and in particular to a pixel circuit and a display device. Background Art

[0002] In an OLED (Organic Light-Emitting Diode) display panel, a thin film transistor (TFT) is typically used as the display switch of the display panel. However, due to the inherent characteristics of TFT, its threshold voltage will change with aging, light exposure, temperature, and other factors. This threshold voltage change can cause instability in the driving current of the OLED, which in turn leads to uneven display of the OLED panel. To address this issue, a compensation circuit is typically provided for the display switch in the related art to eliminate this problem. The compensation circuit provides an energy storage module between the gate and source of the display switch. The energy storage module can store the threshold voltage and light emission data of the display switch, thereby controlling the conduction degree of the display switch, so that the drain-source current of the display switch is not affected by changes in its threshold voltage VTH, thereby achieving voltage compensation for the display switch and ensuring stable light emission of the OLED.

[0003] The disadvantage of the above-mentioned related technology is that at the beginning of the OLED's light-emitting cycle, the gate-source voltage of the display switch needs to be reset. The compensation circuit in the related technology usually clears the residual power in the energy storage module by changing the source voltage of the display switch to the initial voltage, thereby resetting the gate voltage of the display switch. During the reset phase of the display switch, the gate of the display switch needs to be connected to the power supply end, so the gate voltage of the display switch will be limited by the power supply voltage. Therefore, in order to enable the energy storage capacitor to discharge smoothly, the selectable voltage range of the initial voltage is relatively small, which is not conducive to improving the flicker phenomenon of the display panel. Summary of the Invention

[0004] The present invention aims to at least partially address one of the technical problems in the related art. To this end, a first object of the present invention is to provide a pixel circuit that, during a reset phase of the circuit, controls a first reset module and a driving module to couple an initial voltage and a supply voltage to a first node, and controls a second reset module to provide the initial voltage to a second node, thereby resetting the voltages of the first and second nodes. This allows the selection of the initial voltage to be independent of the supply voltage, thereby broadening the range of the initial voltage selection and providing favorable conditions for improving flicker in the pixel circuit.

[0005] A second object of the present invention is to provide a display device.

[0006] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a pixel circuit, including: a first reset module, a second reset module, an energy storage module, a compensation module and a control driving module, wherein the first reset module is respectively connected to the first scanning signal end, the initial voltage end and the first node; the second reset module is respectively connected to the second scanning signal end, the initial voltage end and the second node; the energy storage module is connected between the first node and the second node; the compensation module is respectively connected to the first node and the second scanning signal end; the control driving module is respectively connected to the power supply end, the first control signal end and the compensation module; in the reset stage, the first reset module, the second reset module, the compensation module and the control driving module reset the voltages of the first node and the second node based on the initial voltage of the initial voltage end and the power supply voltage of the power supply end under the action of the first scanning signal of the first scanning signal end, the second scanning signal of the second scanning signal end and the first control signal of the first control signal end.

[0007] According to the pixel circuit of an embodiment of the present invention, during the reset phase of the circuit, the first reset module and the control driving module are controlled to couple the initial voltage and the power supply voltage to the first node, and the second reset module is controlled to provide the initial voltage to the second node, so as to reset the voltages of the first node and the second node. This makes the voltage selection of the initial voltage not limited by the power supply voltage, thereby broadening the selection range of the initial voltage and providing favorable conditions for improving the flicker phenomenon of the pixel circuit.

[0008] According to one embodiment of the present invention, the first reset module includes: a first switch tube, the first end of the first switch tube is connected to the initial voltage end, the second end of the first switch tube is connected to the first node, and the control end of the first switch tube is connected to the first scan signal end; the second reset module includes: a second switch tube, the first end of the second switch tube is connected to the initial voltage end, the second end of the second switch tube is connected to the second node, and the control end of the second switch tube is connected to the second scan signal end.

[0009] According to one embodiment of the present invention, the compensation module includes: a third switch tube, a first end of the third switch tube is connected to the first node, a second end of the third switch tube is connected to the control drive module, and a control end of the third switch tube is connected to the second scan signal end.

[0010] According to one embodiment of the present invention, the control driving module includes: a fourth switch tube, a first end of the fourth switch tube is connected to the power supply end, a second end of the fourth switch tube is connected to the compensation module, and a control end of the fourth switch tube is connected to the first control signal end.

[0011] According to one embodiment of the present invention, the control driving module is also connected to the first node, the second node, the second control signal terminal, the ground terminal and the third node. In the light-emitting stage, the control driving module drives the light-emitting diode to emit light based on the input data of the third node under the action of the first control signal at the first control signal terminal, the voltage of the first node and the second control signal at the second control signal terminal.

[0012] According to one embodiment of the present invention, the control and driving module further includes: a fifth switch tube, wherein the first end of the fifth switch tube is respectively connected to the second end of the fourth switch tube and the compensation module, and the control end of the fifth switch tube is connected to the first node; and a sixth switch tube, wherein the first end of the sixth switch tube is respectively connected to the second end of the fifth switch tube and the third node, the second end of the sixth switch tube is respectively connected to the anode and the second node of the light-emitting diode, the control end of the sixth switch tube is connected to the second control signal end, and the cathode of the light-emitting diode is connected to the ground end.

[0013] According to one embodiment of the present invention, the pixel circuit also includes: a data writing module, which is respectively connected to the data input terminal, the third scanning signal terminal and the third node; in the data writing stage, the data writing module writes the input data of the data input terminal to the third node under the action of the third scanning signal of the third scanning signal terminal, and the compensation module writes the input data from the third node to the first node under the action of the second scanning signal of the second scanning signal terminal, and performs threshold voltage compensation on the first node.

[0014] According to one embodiment of the present invention, the data writing module includes: a seventh switch tube, the first end of the seventh switch tube is connected to the data input end, the second end of the seventh switch tube is connected to the third node, and the control end of the seventh switch tube is connected to the third scan signal end.

[0015] According to one embodiment of the present invention, the energy storage module includes an energy storage capacitor, one end of the energy storage capacitor is connected to the first node, and the other end of the energy storage capacitor is connected to the second node.

[0016] To achieve the above-mentioned objective, a second embodiment of the present invention provides a display device including the aforementioned pixel circuit.

[0017] According to the display device of the embodiment of the present invention, the aforementioned pixel circuit can broaden the voltage selection range of the initial voltage when the pixel circuit is reset, thereby more simply improving the flicker phenomenon of the display device.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1is a structural schematic diagram of a pixel circuit according to an embodiment of the present invention;

[0020] Figure 2 is a circuit diagram of a pixel circuit according to an embodiment of the present invention;

[0021] Figure 3 is a control timing diagram of a pixel circuit according to an embodiment of the present invention;

[0022] Figure 4 is a circuit diagram of a pixel circuit according to another embodiment of the present invention;

[0023] Figure 5 FIG. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0025] The pixel circuit and display device provided by the embodiments of the present invention are described below with reference to the accompanying drawings.

[0026] Figure 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention, referring to Figure 1 As shown, the pixel circuit 100 includes: a first reset module 110, a second reset module 120, an energy storage module 130, a compensation module 140 and a control and driving module 150, wherein the first reset module 110 is respectively connected to the first scan signal terminal SCAN1, the initial voltage terminal VINI and the first node J1; the second reset module 120 is respectively connected to the second scan signal terminal SCAN2, the initial voltage terminal VINI and the second node J2; the energy storage module 130 is connected between the first node J1 and the second node J2; the compensation module 140 is respectively connected to the first node J1 and the second scan signal terminal SC AN2 is connected; the control driving module 150 is respectively connected to the power supply terminal VDD, the first control signal terminal EM1 and the compensation module 140; in the reset stage, the first reset module 110, the second reset module 120, the compensation module 140 and the control driving module 150 reset the voltages of the first node J1 and the second node J2 based on the initial voltage of the initial voltage terminal VINI and the power supply voltage of the power supply terminal VDD under the action of the first scanning signal SCAN1 of the first scanning signal terminal, the second scanning signal of the second scanning signal terminal SCAM2 and the first control signal of the first control signal terminal EM1.

[0027] Specifically, a light-emitting cycle of the pixel circuit 100 can be divided into four stages, namely, a reset stage t1, a data writing stage t2, a holding stage t3, and a light-emitting stage t4. The main function of the reset stage t1 is to reset the voltage across the energy storage module 130, that is, the voltage of the first node J1 and the second node J2. In the embodiment of the present invention, Figure 1 As shown, in the reset stage, the first reset module 110 is turned on under the control of the first scan signal, so that the initial voltage of the initial voltage terminal VINI is coupled to the first node J1; at the same time, the compensation module 140 is turned on under the control of the second scan signal, and the control drive module 150 is turned on under the control of the first control signal, so that the power supply voltage provided by the power supply terminal VDD is coupled to the first node J1. At this time, the voltage of the first node J1 can be quickly reset to the power supply voltage minus the initial voltage (VDD-VINI); at the same time, the second reset module 120 is turned on under the control of the second scan signal, so that the voltage of the second node J2 is reset to the initial voltage VINI. At this time, the voltage reset of the first node J1 and the second node J2 is completed. In the above process, since the initial voltage of the initial voltage terminal VINI can be coupled to the first node J1 through the first reset module 110 without passing through the energy storage module 130, the selection of the initial voltage of the initial voltage terminal VINI is not limited by the power supply voltage, thereby widening the selection range of the initial voltage, and the first reset module 110 and the second reset module 120 can be turned on at the same time according to the corresponding scan signal, so that the first node J1 and the second node J2 are reset at the same time, thereby saving reset time.

[0028] The flicker phenomenon of the pixel circuit 100 refers to the fact that when the light-emitting diode in the pixel circuit 100 switches between light-emitting cycles, the light-emitting parameters of the previous light-emitting cycle remain, thereby making the light-emitting diode unstable and causing flicker. This flicker phenomenon is usually caused by the pixel circuit 100 failing to complete the reset of the first node J1 and the second node voltage J2 during the reset phase of the light-emitting cycle, causing the energy storage module 130 to operate abnormally. Therefore, the reset speed of the first node J1 can be increased by changing the initial voltage of the initial voltage terminal VINI, thereby improving the flicker phenomenon of the pixel circuit 100. In the related art, since the selection range of the initial voltage is narrow, the improvement of the flicker phenomenon is also relatively limited. In the embodiment of the present invention, since the selection of the initial voltage is not limited by the supply voltage, the initial voltage can be set to a voltage value that can maximize the effect of improving the flicker phenomenon, thereby effectively improving the flicker phenomenon of the pixel circuit 100.

[0029] In the above embodiment, during the reset phase of the circuit, the first reset module and the driving module are controlled to couple the initial voltage and the power supply voltage to the first node, and the second reset module is controlled to provide the initial voltage to the second node to reset the voltages of the first node and the second node. This allows the voltage selection of the initial voltage to be unrestricted by the power supply voltage, thereby broadening the selection range of the initial voltage and providing favorable conditions for improving the flickering phenomenon of the pixel circuit.

[0030] In some embodiments, reference Figure 2 As shown, the first reset module 110 includes: a first switch tube T1, a first end of the first switch tube T1 is connected to the initial voltage terminal VINI, a second end of the first switch tube T1 is connected to the first node J1, and a control end of the first switch tube T1 is connected to the first scan signal terminal SCAN1; the second reset module 120 includes: a second switch tube T2, a first end of the second switch tube T2 is connected to the initial voltage terminal VINI, a second end of the second switch tube T2 is connected to the second node J2, and a control end of the second switch tube T2 is connected to the second scan signal terminal SCAN2.

[0031] Furthermore, the compensation module 140 includes: a third switch tube T3, a first end of the third switch tube T3 is connected to the first node, a second end of the third switch tube T3 is connected to the control driving module 150, and a control end of the third switch tube T3 is connected to the second scan signal end SCAN2.

[0032] Furthermore, the control driving module 150 includes: a fourth switch tube T4, a first end of the fourth switch tube T4 is connected to the power supply end VDD, a second end of the fourth switch tube T4 is connected to the compensation module 140, and a control end of the fourth switch tube T4 is connected to the first control signal end EM1.

[0033] Furthermore, the energy storage module 130 includes an energy storage capacitor C, one end of the energy storage capacitor C is connected to the first node J1, and the other end of the energy storage capacitor C is connected to the second node J2.

[0034] Specifically, refer to Figure 2 As shown, the first switch tube T1 to the fourth switch tube T4 can be N-type transistors, such as N-type TFT (thin film transistor), etc., and the specific details are not limited here. The control logic of the first switch tube T1 to the fourth switch tube T4 is as follows Figure 3As shown, in the reset phase t2, the first scan signal terminal SCAN1, the second scan signal terminal SCAN2, and the first control signal terminal EM1 all output a high level, thereby turning on the first switch tube T1 to the fourth switch tube T4. At this time, the supply voltage of the power supply terminal VDD is coupled to the first node J1 through the fourth switch tube T4 and the third switch tube T3. At the same time, the initial voltage of the initial voltage terminal VINI is coupled to the first node J1 through the first switch tube T1, so that the voltage of the first node J1 becomes the supply voltage minus the initial voltage (VDD-VINI), thereby resetting the voltage of the first node J1; at the same time, the initial voltage of the initial voltage terminal VINI is transmitted to the second node J2 through the second switch tube T2, so that the voltage of the second node J2 becomes the initial voltage VINI, thereby resetting the voltage of the second node J2, that is, resetting the voltage across the energy storage capacitor C, so as to quickly clear the residual electricity in the energy storage capacitor C, thereby achieving the reset function of the pixel circuit 100.

[0035] In the above embodiment, during the reset phase, the first switch tube is controlled to be turned on to couple the initial voltage to the first node, the second switch tube is controlled to be turned on to provide the initial voltage to the second node, and the third switch tube and the fourth switch tube are controlled to be turned on to couple the supply voltage to the first node, thereby achieving simultaneous resetting of the voltages of the first node and the second node, avoiding the limitation of the supply voltage on the initial voltage, broadening the selection range of the initial voltage, and providing favorable conditions for improving the flickering phenomenon of the display panel.

[0036] In some embodiments, reference Figure 4 As shown, the control driving module 150 is also connected to the first node J1, the second node J2, the second control signal terminal EM2, the ground terminal GND and the third node J3. In the light-emitting stage, the control driving module 150 drives the light-emitting diode D to emit light based on the input data of the third node J3 under the action of the first control signal of the first control signal terminal EM1, the voltage of the first node J1 and the second control signal of the second control signal terminal EM2.

[0037] Furthermore, the control and driving module 150 includes: a fifth switch tube T5 and a sixth switch tube T6, wherein a first end of the fifth switch tube T5 is respectively connected to the second end of the fourth switch tube T4 and the compensation module 140, and a control end of the fifth switch tube T5 is connected to the first node J1; a first end of the sixth switch tube T6 is respectively connected to the second end of the fifth switch tube T5 and the third node J3, a second end of the sixth switch tube T6 is respectively connected to the anode of the light-emitting diode D and the second node J2, a control end of the sixth switch tube T6 is connected to the second control signal terminal EM2, and a cathode of the light-emitting diode D is connected to the ground terminal GND.

[0038] For further reference, Figure 4As shown, the pixel circuit 100 further includes: a data writing module 160, which is respectively connected to the data input terminal VDATA, the third scan signal terminal SCAN3 and the third node J3; in the data writing stage, the data writing module 160 writes the input data of the data input terminal VDATA into the third node J3 under the action of the third scan signal of the third scan signal terminal SCAN3, and the compensation module 140 writes the input data from the third node J3 to the first node J1 under the action of the second scan signal of the second scan signal terminal SCAN2, and performs threshold voltage compensation on the first node J1.

[0039] Furthermore, the data writing module 160 includes: a seventh switch tube T7, a first end of the seventh switch tube T7 is connected to the data input end VDATA, a second end of the seventh switch tube T7 is connected to the third node J3, and a control end of the seventh switch tube T7 is connected to the third scan signal end SCAN3.

[0040] Specifically, the fifth switch tube T5 to the seventh switch tube T7 can be N-type transistors, such as N-type TFTs. The control logic of the fifth switch tube T5 to the seventh switch tube T7 is as follows: Figure 3 As shown, in the data writing phase t2 of the pixel circuit 100, the working state of the pixel circuit 100 can be divided into two parts, referring to Figure 3As shown, in the first part of the phase t2, the first scan signal terminal SCAN1, the second scan signal terminal SCAN2, the first control signal terminal EM1 and the second control signal terminal EM2 all output a low level, and the third scan signal terminal SCAN3 outputs a high level, so that only the seventh switch transistor T7 among the first to seventh switch transistors T1 to T7 is turned on. At this time, the input data of the data input terminal VDATA is provided to the third node J3 through the seventh switch transistor T7, where the input data refers to a voltage signal with a fixed voltage value; subsequently, in the second part of the phase t2, the second scan signal terminal SCAN2 switches to a high level output, so that the second switch transistor T2 and the third switch transistor T3 are switched to a conductive state, and the output levels of the other signal terminals remain unchanged. At this time, the voltage at the second node J2 is VDD-VIN, so that the fifth switch transistor T5 is partially turned on, and the input data of the data input terminal VDATA can be coupled to the first node J2 through the seventh switch transistor T7, the fifth switch transistor T5, and the third switch transistor T3. At point J1, the voltage of the first node J1 changes, and the charge of the energy storage capacitor C changes, so that the energy storage capacitor C stores the input data. As the voltage of the first node J1 changes, the fifth switch transistor T5 is gradually turned on. During the conduction process, the fifth switch transistor T5 generates a voltage drop, which is also coupled to the first node J1 through the third switch transistor T3. As the conduction degree of the fifth switch transistor T5 gradually increases, the voltage drop gradually decreases. When the fifth switch transistor T5 is fully turned on, it stabilizes. At this time, the voltage drop is equal to the threshold voltage VTH of the fifth switch transistor T5. The threshold voltage VTH is also stored in the energy storage capacitor C, thereby completing the threshold voltage compensation function of the first node J1. At the end of the data writing phase t2 of the pixel circuit 100, the voltage of the first node J1 is the input data plus the threshold voltage (VDATA+VTH), and the voltage of the second node J2 is the initial voltage VIN. Correspondingly, the voltage across the energy storage capacitor C is the input data plus the threshold voltage minus the initial voltage (VDATA+VTH-VIN).

[0041] Continue to refer Figure 3As shown, during the holding phase t3 of the pixel circuit 100, the working state of the pixel circuit 100 can also be divided into two parts. In the first part of the t3 phase, the first to third scan signal terminals (SCAN-SCAN3) and the first to second control signal terminals (EM1-EM2) all output low levels, causing the circuit to stop data writing, thereby isolating the data writing phase and the holding phase of the pixel circuit 100 and avoiding logic errors. In the second part of the t3 phase, the second control signal terminal EM2 is switched to a high level. At this time, the sixth switch tube T6 is turned on, making the source voltage of the fifth switch tube T5 equal to the voltage of the second node J2. At this time, the conduction degree of the fifth switch tube T5 is determined by the voltage difference between the first node J1 and the second node J2, that is, the voltage across the energy storage capacitor C. During the t3 phase, the voltages of the first node J1 and the second node J2 do not change. Subsequently, the pixel circuit enters the light-emitting stage t4. At this time, the first to third scan signal terminals (SCAN~SCAN3) remain at a low level, the second control signal terminal EM2 remains at a low level, and the first control signal terminal EM1 switches to a high level output, turning on the fourth switch tube T4. At this time, the power supply VDD provides the supply voltage to the light-emitting diode D through the fourth switch tube T4, the fifth switch tube T5, and the sixth switch tube T6, so that the light-emitting diode D emits light normally, and the light-emitting process of the pixel circuit 100 ends.

[0042] In the light-emitting process of the pixel circuit 100, in the light-emitting stage t4, when the light-emitting diode D emits light normally, the drain-source current Ids of the fifth switch tube T5 can be calculated by the following formula (1):

[0043] Ids=K*(Vgs-VTH) 2 / twenty one)

[0044] Where K is the current amplification factor driving the fifth switch T5, which is determined by the characteristics of the fifth switch T5 itself, Vgs is the gate-source voltage difference driving the fifth switch T5 (i.e., the voltage difference between the first node J1 and the second node J2), and VTH is the threshold voltage of the fifth switch T5. As can be seen from the above, during the holding phase t3 and the light-emitting phase t4, the first to third switches (T1-T3) are not turned on, so the energy storage capacitor C does not form a charge-discharge loop, and the voltage difference between the first node J1 and the second node J2 remains unchanged. Therefore, the gate-source voltage Vgs of the fifth switch T5 is the voltage across the energy storage capacitor C at the end of the data writing phase, that is, the input data plus the threshold voltage minus the initial voltage (VDATA+VTH-VIN). Substituting this into the above formula (1), the following formula (2) can be obtained:

[0045] Ids=K*(VDATA-VIN) 2 / twenty two)

[0046] Wherein, VDATA is the input data, and VIN is the initial voltage. As can be seen from the above formula (2), in the light-emitting stage, since the threshold voltage compensation has been performed on the second node J2, the drain-source current Ids of the fifth switch tube T5 is independent of the threshold voltage VTH of the fifth switch tube T5, thereby ensuring stable light emission of the light-emitting diode D.

[0047] In the above embodiment, during the data writing stage, the second switch tube, the third switch tube, and the seventh switch tube are controlled to be turned on to write the input data into the first node, and the threshold voltage compensation is performed on the first node, so that when the pixel circuit is in the light-emitting stage, the drain-source current is not affected by the threshold voltage of the fifth switch tube, and the light-emitting diode of the pixel circuit can emit light stably, thereby realizing the threshold voltage compensation function of the switch tube in the pixel circuit.

[0048] Optionally, the first control signal terminal EM1 and the second control signal terminal EM2 may use the same logic level generating circuit, referring to Figure 3 As shown, the control logic level waveforms of the first control signal terminal EM1 and the second control signal terminal EM2 are consistent, and only differ in timing. Therefore, the same logic level generating circuit can be used to provide control signals for the first control signal terminal EM1 and the second control signal terminal EM2. Only the timing of the two control signal terminals needs to be adjusted, thereby simplifying the control circuit of the pixel circuit.

[0049] In summary, according to the pixel circuit of the embodiment of the present invention, in the reset stage, the first switch tube is controlled to be turned on to couple the initial voltage to the first node, the second switch tube is controlled to be turned on to provide the initial voltage to the second node, and the third switch tube and the fourth switch tube are controlled to be turned on to couple the supply voltage to the first node; and in the data writing stage, the second switch tube, the third switch tube and the seventh switch tube are controlled to be turned on to write the input data into the first node, and the threshold voltage compensation is performed on the first node, so that when the pixel circuit is in the light-emitting stage, the drain-source current is not affected by the threshold voltage of the fifth switch tube, and the light-emitting diode of the pixel circuit can emit light stably, thereby realizing the threshold voltage compensation function of the switch tube in the pixel circuit, and realizing the simultaneous reset of the voltages of the first node and the second node, and avoiding the limitation of the supply voltage on the initial voltage, thereby broadening the selection range of the initial voltage, and providing favorable conditions for improving the flicker phenomenon of the display panel.

[0050] In some embodiments, the present invention further provides a display device, referring to Figure 5 As shown, the display device 1000 includes the aforementioned pixel circuit 100 .

[0051] The display device according to the embodiment of the present invention can not only realize threshold voltage compensation of the pixel circuit to ensure stable light emission of the display device, but also widen the voltage selection range of the initial voltage of the pixel circuit, so that the display device can more simply improve the flicker phenomenon.

[0052] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0053] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0054] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0056] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A pixel circuit, characterized in that: include: A first reset module, a second reset module, an energy storage module, a compensation module and a control drive module, wherein: The first reset module is connected to the first scan signal terminal, the initial voltage terminal and the first node respectively; The second reset module is connected to the second scan signal terminal, the initial voltage terminal and the second node respectively; The energy storage module is connected between the first node and the second node; The compensation module is connected to the first node and the second scanning signal terminal respectively; The control drive module is respectively connected to the power supply terminal, the first control signal terminal and the compensation module; In a reset phase, the first reset module, the second reset module, the compensation module, and the control driving module reset the voltages of the first node and the second node based on the initial voltage of the initial voltage terminal and the power supply voltage of the power supply terminal under the action of the first scan signal of the first scan signal terminal, the second scan signal of the second scan signal terminal, and the first control signal of the first control signal terminal; The control drive module includes: a fourth switch tube, wherein a first end of the fourth switch tube is connected to the power supply end, a second end of the fourth switch tube is connected to the compensation module, and a control end of the fourth switch tube is connected to the first control signal end; The control driving module is also connected to the first node, the second node, the second control signal terminal, the ground terminal and the third node. In the light-emitting stage, the control driving module drives the light-emitting diode to emit light based on the input data of the third node under the action of the first control signal of the first control signal terminal, the voltage of the first node, and the second control signal of the second control signal terminal; The control drive module also includes: a fifth switch tube, wherein a first end of the fifth switch tube is connected to the second end of the fourth switch tube and the compensation module respectively, and a control end of the fifth switch tube is connected to the first node; a sixth switching tube, wherein a first end of the sixth switching tube is respectively connected to the second end of the fifth switching tube and the third node, a second end of the sixth switching tube is respectively connected to the anode of the light-emitting diode and the second node, a control end of the sixth switching tube is connected to the second control signal end, and a cathode of the light-emitting diode is connected to the ground end.

2. The pixel circuit according to claim 1, wherein: The first reset module includes: a first switching transistor, wherein a first terminal of the first switching transistor is connected to the initial voltage terminal, a second terminal of the first switching transistor is connected to the first node, and a control terminal of the first switching transistor is connected to the first scan signal terminal; The second reset module includes: A second switch tube, wherein a first end of the second switch tube is connected to the initial voltage end, a second end of the second switch tube is connected to the second node, and a control end of the second switch tube is connected to the second scan signal end.

3. The pixel circuit according to claim 1, wherein: The compensation module includes: A third switch tube, wherein a first end of the third switch tube is connected to the first node, a second end of the third switch tube is connected to the control driving module, and a control end of the third switch tube is connected to the second scan signal end.

4. The pixel circuit according to claim 1, wherein: The pixel circuit further includes: a data writing module, wherein the data writing module is connected to the data input terminal, the third scanning signal terminal and the third node respectively; In the data writing stage, the data writing module writes the input data of the data input end into the third node under the action of the third scanning signal of the third scanning signal end, and the compensation module writes the input data from the third node into the first node under the action of the second scanning signal of the second scanning signal end, and performs threshold voltage compensation on the first node.

5. The pixel circuit according to claim 4, wherein: The data writing module includes: A seventh switch tube, wherein a first end of the seventh switch tube is connected to the data input end, a second end of the seventh switch tube is connected to the third node, and a control end of the seventh switch tube is connected to the third scan signal end.

6. The pixel circuit according to claim 1, wherein: The energy storage module includes an energy storage capacitor, one end of the energy storage capacitor is connected to the first node, and the other end of the energy storage capacitor is connected to the second node.

7. A display device, characterized in that: The method comprises the pixel circuit according to any one of claims 1 to 6.

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